package com.atguigu.flink.chapter06.state.keyed;

import com.atguigu.flink.bean.WaterSensor;
import com.atguigu.flink.function.WaterSensorMapFunction;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/*
键控状态：
    值状态
 */
public class ValueStateDemo {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port",2000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);

        //输出每个传感器的最大水位
        env.socketTextStream("hadoop102",8888)
                .map(new WaterSensorMapFunction())
                .keyBy(WaterSensor::getId)
                .process(new KeyedProcessFunction<String, WaterSensor, String>() {
                    private ValueState<Integer> maxVcState;

                    @Override
                    public void open(Configuration parameters) throws Exception {
                        //在open方法中获取需要的键控状态
                        maxVcState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("maxVc",Integer.class));
                    }

                    @Override
                    public void processElement(WaterSensor value,
                                               Context ctx,
                                               Collector<String> out) throws Exception {
                        Integer currentVc = value.getVc();
                        //获取状态中的值
                        Integer maxVc = maxVcState.value();
                        if (maxVc != null && currentVc > maxVc){
                            maxVc = currentVc;
                        } else if (maxVc == null) {
                            maxVc = currentVc;
                        }
                        maxVcState.update(currentVc); //更新状态中的值

                        out.collect(ctx.getCurrentKey()  +"的最大水位值：" + maxVc);

                    }
                })
                .print();

        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}







//public class ValueStateDemo {
//    public static void main(String[] args) {
//        Configuration conf = new Configuration();
//        conf.setInteger("rest.port",2000);
//        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
//        env.setParallelism(1);
//
//        //输出每个传感器的最大水位
//        env.socketTextStream("hadoop102",8888)
//                .map(new WaterSensorMapFunction())
//                .keyBy(WaterSensor::getId)
//                .process(new KeyedProcessFunction<String, WaterSensor, String>() {
//
//                    private ValueState<Integer> maxVcState;
//
//                    @Override
//                    public void open(Configuration parameters) throws Exception {
//                        //在open方法中获取需要的键控状态
//                        maxVcState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("maxVc", Integer.class));
//                    }
//
//                    @Override
//                    public void processElement(WaterSensor value,
//                                               Context ctx,
//                                               Collector<String> out) throws Exception {
//                        Integer currentVc = value.getVc();
//                        //获取状态中的值
//                        Integer maxVc = maxVcState.value();
//
//                        if (maxVc != null && currentVc > maxVc){
//                            maxVc = currentVc;
//                        } else if (maxVc == null) {
//                            maxVc = currentVc;
//                        }
//
//                        maxVcState.update(currentVc); //更新状态中的值
//
//                        out.collect(ctx.getCurrentKey() + "的最大水位值：" + maxVc);
//                    }
//                })
//                .print();
//
//        try {
//            env.execute();
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }
//}




//public class ValueStateDemo {
//    public static void main(String[] args) {
//        Configuration conf = new Configuration();
//        conf.setInteger("rest.port",2000);
//        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
//        env.setParallelism(1);
//
//        //输出每个传感器的最大水位
//        env.socketTextStream("hadoop102",8888)
//                .map(new WaterSensorMapFunction())
//                .keyBy(WaterSensor::getId)
//                .process(new KeyedProcessFunction<String, WaterSensor, String>() {
//                    private ValueState<Integer> maxVcState;
//
//                    @Override
//                    public void open(Configuration parameters) throws Exception {
//                        //从open方法中获取需要的键控状态
//                        maxVcState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("maxVc", Integer.class));
//                    }
//
//                    @Override
//                    public void processElement(WaterSensor value,
//                                               Context ctx,
//                                               Collector<String> out) throws Exception {
//                        Integer currentVc = value.getVc();
//                        //获取状态中的值
//                        Integer maxVc = maxVcState.value();
//                        if (maxVc != null && currentVc > maxVc){
//                            maxVc = currentVc;
//                        } else if (maxVc == null) {
//                            maxVc = currentVc;
//                        }
//
//                        maxVcState.update(maxVc); //更新状态中的值
//                        out.collect(ctx.getCurrentKey() + "的最大水位值："  + maxVc);
//                    }
//                })
//                .print();
//
//        try {
//            env.execute();
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }
//}